package com.itheima.day08.myHashSet.test4;

import java.util.HashSet;

public class Test {
    public static void main(String[] args) {
        HashSet<String> hs = new HashSet<>();
        hs.add("123");
        hs.add("456");
        hs.add("123");
        hs.add("789");

        System.out.println(hs);
    }
}
